import java.util.HashMap;
import java.util.Map;

public class LC_1 {
    public int[] twoSum(int[] nums, int target) {

        Map<Integer,Integer> map = new HashMap<>();
        for(int i = 0; i < nums.length; i++){
            if(map.containsKey(target - nums[i]) == true){
                return new int[]{i,map.get(target - nums[i])};
            }
            map.put(nums[i],i);
        }
        return null;
    }
}
